Title: Constitutive models characterisation for XC48 steel in compression by a parametric identification technique

Authors: B. Langrand, E. Markiewicz, P. Drazetic, P. Geoffroy, J.L. Petitniot, J. Fabis

Addresses: Industrial and Human Control and Mechanical Engineering Laboratory, Mechanical Engineering Research Group, URA CNRS D1775, University of Valenciennes, B.P. 31 1-59304 Valenciennes Cedex, France. ' Industrial and Human Control and Mechanical Engineering Laboratory, Mechanical Engineering Research Group, URA CNRS D1775, University of Valenciennes, B.P. 31 1-59304 Valenciennes Cedex, France. ' Industrial and Human Control and Mechanical Engineering Laboratory, Mechanical Engineering Research Group, URA CNRS D1775, University of Valenciennes, B.P. 31 1-59304 Valenciennes Cedex, France. ' Fluid Mechanical Institute of Lille, Entity of ONERA, 59800 Lille, France. ' Fluid Mechanical Institute of Lille, Entity of ONERA, 59800 Lille, France. ' Fluid Mechanical Institute of Lille, Entity of ONERA, 59800 Lille, France

Abstract: This paper deals with a parametric identification technique, based on conjugate gradient methods. As part of this research, compression tests are performed on a XC48 steel (AFNOR norm 1048AISI), which is strain rate sensitive. Two kinds of specimen, tubular and cylindrical |dumbbells|, are tested at different strain rates, from to 10−3 to 130s−1, and for impact velocities ranging from 5 mm/mn to 6 m/s. The parameters of the Johnson-Cook constitutive model are evaluated directly from the XC48 steel compression stress-strain diagrams expressed in terms of true stress and strain measurements. These parameters are next used as input data for a FE crash simulation of the tubular specimen. Comparison with experimental results prove the validity of the identified parameters.

Keywords: compression testing; parametric identification; XC48 steel; constitutive models; strain rate; impact velocity; stress; crash simulation; finite element method; FEM.

DOI: 10.1504/IJMPT.1997.036379

International Journal of Materials and Product Technology, 1997 Vol.12 No.4/5/6, pp.428 - 446

Published online: 02 Nov 2010 *

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